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P1 - The Universe: Distances and Sizes
- Distances and Sizes
- The Sun is one of thousands of millions of stars in the Milk Way
- The Milky Way is one of thousands of millions of galaxies which
make up the Universe
- The Milky Way is one of thousands of millions of galaxies which
make up the Universe
- Distances to objects outside the solar system are measured in light-years
- A light year is the distance that light travels in a year.
- One light year is 9.5 million million kilometres.
- One light year is 9.5 million million kilometres.
- A light year is the distance that light travels in a year.
- Light travels through space (a vacuum) at a speed of
3.0 x 3000 000 km/s
- Light takes a very long time to reach us from the stars.
- We can only observe what stars were like in the past, when the light left them.
- We can only observe what stars were like in the past, when the light left them.
- Light takes a very long time to reach us from the stars.
- The Sun is one of thousands of millions of stars in the Milk Way
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